The performer begins with a black silk streamer that visibly changes into rainbow colors with just a shake of the wrist. Or do it in reverse so a multi-color streamer becomes black. Jeff McBride demonstrates this in one of his popular Magic on Stage videos.

This is a great effect to use with the coloring book, vanishing crayons; creating a magical rainbow, etc.

Very large and very visible; instant change. This is a great item for both magicians and clowns.